Loans Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Recorded Investment:
With No Related Allowance	$ 807	$ 2,929
With a Related Allowance	294	294
Unpaid Principal Balance:
With No Related Allowance	806	2,928
With a Related Allowance	295	293
Average Recorded Balance:
With No Related Allowance	1,869	2,537	$ 2,113
With a Related Allowance	294	920	773
Interest Income Recognized:
With No Related Allowance	9	19	57
With a Related Allowance	0	0	26
Cash Basis Income:
With No Related Allowance	0	0	0
With a Related Allowance	0	0	0
Commercial
Recorded Investment:
With No Related Allowance	0	430
With a Related Allowance	34	0
Unpaid Principal Balance:
With No Related Allowance	0	429
With a Related Allowance	35	0
Average Recorded Balance:
With No Related Allowance	215	215	0
With a Related Allowance	17	243	243
Interest Income Recognized:
With No Related Allowance	0	0	0
With a Related Allowance	0	0	1
Cash Basis Income:
With No Related Allowance	0	0	0
With a Related Allowance	0	0	0
Commercial Real Estate
Recorded Investment:
With No Related Allowance	0	793
With a Related Allowance	0	0
Unpaid Principal Balance:
With No Related Allowance	0	793
With a Related Allowance	0	0
Average Recorded Balance:
With No Related Allowance	397	787	836
With a Related Allowance	0	363	363
Interest Income Recognized:
With No Related Allowance	0	0	34
With a Related Allowance	0	0	2
Cash Basis Income:
With No Related Allowance	0	0	0
With a Related Allowance	0	0	0
Other Consumer
Recorded Investment:
With No Related Allowance	108	101
With a Related Allowance	0	0
Unpaid Principal Balance:
With No Related Allowance	107	100
With a Related Allowance	0	0
Average Recorded Balance:
With No Related Allowance	105	98	93
With a Related Allowance	0	0	0
Interest Income Recognized:
With No Related Allowance	1	1	0
With a Related Allowance	0	0	0
Cash Basis Income:
With No Related Allowance	0	0	0
With a Related Allowance	0	0	0
Residential Portfolio Segment
Recorded Investment:
With No Related Allowance	699	1,605
With a Related Allowance	260	294
Unpaid Principal Balance:
With No Related Allowance	699	1,606
With a Related Allowance	260	293
Average Recorded Balance:
With No Related Allowance	1,152	1,437	1,184
With a Related Allowance	277	314	167
Interest Income Recognized:
With No Related Allowance	8	18	23
With a Related Allowance	0	0	23
Cash Basis Income:
With No Related Allowance	0	0	0
With a Related Allowance	$ 0	$ 0	$ 0

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